FIB - I am torn on what advice to give for this. All I can say is consider issues like this when writting up the parenting plan so that it is clear on who has them for what types of events and when.

Here ara a couple of books you might consider reading...

Divorce Poison: Protecting the Parent-Child Bond from a Vindictive Ex

Joint Custody with a Jerk: Raising a Child with an Uncooperative Ex